8/26

Datasheet

Datasheet

BM1Q011FJ

TSZ02201-0F1F0A200180-1-2

21.Jan.2016 Rev.001

© 2016 ROHM Co., Ltd. All rights reserved.

www.rohm.com

TSZ22111・15・001

(1-2) a case without using VH pin

This IC is also possible to start by connecting the start-up resistor to the VCC pin in the open start-up circuit (650V

breakdown voltage) of the VH pin. The structure that does not use the recharge function is shown in Figure 9.At

Figure 9. Application Circuit without using the VH pin

・

How to set the start-up resistance

Start-up resistor Rstart shown in Figure 9 is necessary for the IC to start if you do not use the VH pin. If the value of

Rstart is small, the standby power is increased and the start-up time becomes shorter. Adversely, if the value of Rstart

is big, the standby power is reduced and start-up time becomes longer. When the VCC voltage=12V, the standby

ex） The example of start-up resistor Rstart setting

In Vac=100V, if margin is -30%, VH min=100×√2×0.7=99V

For an example, with a sufficient margin to 3.38MΩ, the Rstart is set to 2.0MΩ.In case of AC100V, Power consumption

in Rstart is below.

Pd (Rstart) = (VH-VCC)

Pd in using start-up resistor is more than in using VH pin. However, about the value of VCC pin capacitance and VCC

start-up resistor, please confirm by performing the evaluation of the actual application.

Rstart